Which is correct?

Given 240 kph (240 kilometres per hour) = 149 mph (149 miles per hour)

How does one say this?

>-240 kph **equal** 149 mph.  
-240 kph **equals** 149 mph.  
-240 kph **is equal to** 149 mph.  
-240 kph **are equal to** 149 mph. 

Is 240 kph *singular* or *plural* (kilometre or kilometres)?  
Or 240 kph is a separate kind of thing?